Gas and air mixing valve



p 1934. A. c. FLETCHVER 7 7 ens AND AIR MIXING VALVE Filed July 28, 1932 ATTORNEY.

enema Sept. is, 1934 1,973,977

UNITED STATES PATENT OFFICE GAS AND AIR MIXING VALVE Alberto. Fletcher,' Deer Creek, 'Okl al, assignoi" to Acme Foundry and Machine Company,- Blackwell, Okla, a corporation of Oklahoma Application July 28 1932, Serial No. 625,509 2 Claims; .(cr. ie -180 My invention relates to valves and more particand does not form apart of the present invention, ularly to mixing valves for use on internal combut has been described to more clearly illustrate bustion engines, the principal object of my invenone form of application of a valve embodying tion being to provide a unitary valve for controlmy invention. I v

ling the supply and proportions of gas and air The valve includes abody16preferablyrectanto the combustion chamber of an engine, thereby gular in shape and providedwith openings 17 for efiecting a more complete mixture of the fuel receiving bolts 18 secured in the base member 1 charge and consequent higher degree of efficiency for firmly attaching the valve to the engine. The than can be obtained by separate introduction of valve body is formed with a recess 19 in its lower t the fuel ingredients into an engine. face and as is particularly shown at 20, (Fig. 1),

It is further object of the invention to prothe margin of the recess is of increased depth to vide a valve of simple construction having a miniform a raised shoulder or Valve seat 21.

mum number of parts to facilitate assembling of Provided in the valve body and opening through the valve members and to reduce the cost to manthe recesses are a plurality of ports 22 preferably a 15 ufacture. arranged in a pair of parallel rowsof transversely In accomplishing these and other objects of aligned openings, spaced by a central rib '23 havmy invention, I have provided improved details ing a threaded socket 24 for each of the pair of or" structure, the preferred form of which is illusopenings. A plurality of rectangular spring trated in the accompanying drawing, wherein: blades 25 comparing in number to the pairs of 20 Fig. l is a longitudinal section of a portion of openings and having central apertures 26, are

an engine and of a valve embodying my invention adapted to overlie the series of paired ports so mounted thereon. that a single blade will simultaneously engage Fig. 2 is a perspective View particularly showa pair of seats 21 to cover a pair of the ports 22. ing the upper face of the valve body. The blades are held firmly in the base of the 25 Fig. 3 is a perspective view of the valve as recess by a keeper plate 27 secured to the body viewed from beneath showing the valve members by bolts 28 or the like, extended through the in assembled condition. plate and apertures 26 of the spring blades and Fig. l is a similar view showing the lower rethreaded into the sockets 24, washers 29 being cessed face of the valve body with valve springs preferably mounted on the bolts adjacent their 30 seated therein, one of the springs and a keeper heads to securely anchor the keeper plate to the 35 plate being shown in disassembled relation with valve body.

the body, The keeper plate is of arcuate or concave form Referring more in detail to the drawing: providing wing portions 27' curving from the body 1 designates a portion of an engine base havmember to permit flexing of the spring blades 35 ing an end face 2 provided with threaded openfor opening the ports and is further shaped arcings 3 for mounting a cylinder jacket 4 secured uately to prevent abrupt bending and breaking to the base by bolts 5 which are extended through of the blades. The wing portions 27 further proopenings 6 in end flanges '7 of the jacket and vide elongated outlet ports 2'7" through which threaded into the openings 3. the gas and air flow into the mixing chamber in 40 In the present disclosure illustrating the applisuch a manner as to create turbulence and mixcation of my invention, the engine is of the two ture of the gas and air.

cycle internal combustion type and the base por- In order to admit gas and air simultaneously tion is provided with a dividing wall 8 and with through the valve body, a boss 30 is provided on a lateral inlet opening 9 to the rear of the wall. the upper surface of the body and includes a 45 A cylinder 10, cast integrally with the cylinder channel 31 communicating with one of the ports jacket and projecting into thebase portion into 22 and opening at its opposite end in an enlarged proximity with the wall 8 forms an intake and internally threaded recess 32 for receiving a fuel mixing chamber 11 between the walls of the cylsupply pipe 33 threaded into the recess inder and jacket. 7 Assuming a valve to be constructed as described so As in usual practice, a piston 12 is slidably and to be mounted on an engine in communicamounted in the cylinder and a rod 13 is secured tion with the inlet opening thereof, its operation thereto and extended through packing means 14 is as follows: provided for sealing travel of the rod through the As the piston moves inwardly on its power wall 8. stroke, a vacuum is formed in the inlet chamber, 55- All of the foregoing structure is conventional thereby drawing a charge of gas and air, against the spring tension of the blades, in mixed condition into the inlet chamber.

Upon reverse movement of the piston, the charge in the mixing chamber 11 is compressed to a pressure greater than atmospheric so that the spring blades are retained against their seats, the inherent resiliency of the blades further tending to maintain the ports in closed condition.

It will be noted that the proportion of air and gas is definitely controlled by the combined area of the air inlet openings 22 in relation to the area of the gas inlet opening.

As a result of employing both ends of a spring blade for controlling separate openings, the number of valve parts is reduced and the procedure of assembling the blades in the valve body recess or of replacing a broken blade is simplified by the provision of a single keeper plate for the plurality of blades, it being only necessary when replacing a blade to loosen all of the bolts 28 and to remove the bolt extended through the plate to be replaced. A new spring can then be substituted for the Weak or broken blade, whereupon the bolt is replaced and tightened together with the remaining bolts.

If it'is desired to increase or decrease the amount of fuel admitted to the engine, the keeper plate may be substituted by one having more or less curvature, thereby allowing the spring blades to flex accordingly.

From the foregoing, it will be apparent that I have provided a valve of simple construction, serving to effect a thorough mixture of the fuel ingredients in their passage into the inlet chamber of an engine.

What I claim and desire to secure by Letters Patent is: r

1. A gas and air mixing valve including a body member having parallel rows of aligned ports separated by a central rib, a gas inlet member covering one of said ports on one side of the body member, resilient blades having ends yieldingly covering the aligned ports at opposite sides of the central rib, a curved plate member having a central portion engaging the blades over said rib and having wing portions curving from the body member whereby the ends of the blades are free to move from covering relation with said ports independently of each other, and means extending through the central portion of said curved plate to clamp the central portions of the blades tightly against said rib to effect said independent movement of the ends of the blades.

2. In combination with a gas and air mixing chamber, a gas and air mixing valve for the mixing chamber, including a body member having a rectangular recess and provided with parallel rows of aligned ports opening to said recess, a gas inlet member covering one of said ports, resilient blades covering said ports, a curved plate member having a central portion engaging said blades between the parallel rows of ports and having wings curving away from the ends of said blades and cooperating with the side walls of the recess to form elongated outlets into said mixing chamber at opposite sides of the body member for creating turbulence and mixture of gases passing through said ports into said mixing chamber, and means for securing said plate member to the body member.

ALBERT C. FLETCHER. 

